<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
defined('THINK_PATH') or exit();

/**
 * 系统行为扩展：模板内容输出替换
 * 
 * @category Think
 * @package Think
 * @subpackage Behavior
 * @author liu21st <liu21st@gmail.com>
 */
class ContentReplaceBehavior extends Behavior
{
    // 行为参数定义
    protected $options = array(
        'TMPL_PARSE_STRING' => array()
    );
    
    // 行为扩展的执行入口必须是run
    public function run(&$content)
    {
        $content = $this->templateContentReplace($content);
    }

    /**
     * 模板内容替换
     * 
     * @access protected
     * @param string $content
     *            模板内容
     * @return string
     */
    protected function templateContentReplace($content)
    {
        // 系统默认的特殊变量替换
        $replace = array(
            '__TMPL__' => APP_TMPL_PATH, // 项目模板目录
            '__ROOT__' => __ROOT__, // 当前网站地址
            '__APP__' => __APP__, // 当前项目地址
            '__GROUP__' => defined('GROUP_NAME') ? __GROUP__ : __APP__,
            '__ACTION__' => __ACTION__, // 当前操作地址
            '__SELF__' => __SELF__, // 当前页面地址
            '__URL__' => __URL__,
            '../Public' => APP_TMPL_PATH . 'Public', // 项目公共模板目录
            '__PUBLIC__' => __ROOT__ . '/Public', // 站点公共目录
            '__MODULE__' => MODULE_NAME
        ) // zhanghuihua@msn.com
;
        // 允许用户自定义模板的字符串替换
        if (is_array(C('TMPL_PARSE_STRING')))
            $replace = array_merge($replace, C('TMPL_PARSE_STRING'));
        $content = str_replace(array_keys($replace), array_values($replace), $content);
        return $content;
    }
}